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Income Taxes - Summary of Deferred Taxes Arising from Temporary Differences and Unused Tax Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance $ (15,583) $ 4,113 $ (20,733)
Additions due to acquisition during the year 1,780 17 25,380
Recognized in statement of income (1,807) (9,063) (8,255)
Recognized in equity (46) 1,135 (715)
Recognized in/ Reclassified from other comprehensive income 938 (9,409) 6,921
Foreign currency translation 1,560 (106) 85
Closing balance (13,066) (15,583) 4,113
Deferred tax liabilities [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 15,529 34,530 5,253
Additions due to acquisition during the year   6 24,577
Recognized in statement of income 476 (9,835) (2,742)
Recognized in/ Reclassified from other comprehensive income 1,877 (9,409) 6,921
Foreign currency translation (76) 237 521
Closing balance 17,806 15,529 34,530
Deferred tax liabilities [member] | Intangible assets other than goodwill [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 12,662 21,123 (712)
Additions due to acquisition during the year   6 24,577
Recognized in statement of income (573) (8,555) (2,769)
Foreign currency translation 94 88 27
Closing balance 12,183 12,662 21,123
Deferred tax liabilities [member] | Unrealized gain/(loss) on cash flow hedging and investment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 1,759 12,294 4,857
Recognized in statement of income 46 (1,280) 27
Recognized in/ Reclassified from other comprehensive income 1,877 (9,409) 6,921
Foreign currency translation (143) 154 489
Closing balance 3,539 1,759 12,294
Deferred tax liabilities [member] | Others [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance 1,108 1,113 1,108
Recognized in statement of income 1,003    
Foreign currency translation (27) (5) 5
Closing balance 2,084 1,108 1,113
Deferred tax assets [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance (31,112) (30,417) (25,986)
Additions due to acquisition during the year 1,780 11 803
Recognized in statement of income (2,283) 772 (5,513)
Recognized in equity (46) 1,135 (715)
Recognized in/ Reclassified from other comprehensive income (939)    
Foreign currency translation 1,636 (343) (436)
Closing balance (30,872) (31,112) (30,417)
Deferred tax assets [member] | Others [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance (328) (975) (362)
Additions due to acquisition during the year (3)    
Recognized in statement of income (174) 661 (679)
Foreign currency translation 23 (14) 66
Closing balance (482) (328) (975)
Deferred tax assets [member] | Property and equipment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance (7,291) (5,648) (5,512)
Additions due to acquisition during the year   11 873
Recognized in statement of income (321) (1,623) (932)
Foreign currency translation 539 (31) (77)
Closing balance (7,073) (7,291) (5,648)
Deferred tax assets [member] | Net operating loss carryforward [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance (2,879) (5,722) (3,684)
Recognized in statement of income 1,559 2,950 (2,026)
Foreign currency translation 33 (107) (12)
Closing balance (1,287) (2,879) (5,722)
Deferred tax assets [member] | Accruals deductible on actual payment [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance (7,424) (5,641) (5,352)
Additions due to acquisition during the year 1,783   (70)
Recognized in statement of income (1,214) (1,661) 1
Recognized in/ Reclassified from other comprehensive income (939)    
Foreign currency translation 436 (122) (220)
Closing balance (7,358) (7,424) (5,641)
Deferred tax assets [member] | Share-based payment arrangements [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance (12,770) (12,264) (11,008)
Recognized in statement of income (1,980) 702 (1,781)
Recognized in equity (46) 1,135 (715)
Foreign currency translation 584 (73) (190)
Closing balance (14,120) (12,770) (12,264)
Deferred tax assets [member] | Minimum alternate tax [member]      
Disclosure of temporary difference, unused tax losses and unused tax credits [Line Items]      
Opening balance (420) (167) (68)
Recognized in statement of income (153) (257) (96)
Foreign currency translation 21 4 (3)
Closing balance $ (552) $ (420) $ (167)